线程“main”中的异常 java.lang.NoSuchMethodError: main
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Exception in thread "main" java.lang.NoSuchMethodError: main
提问by Ramesh
Possible Duplicate:
Exception in thread “main” java.lang.NoSuchMethodError: main
I got the above message. The code is as follows:
我收到了上面的消息。代码如下：
class Test
{
public static void main(String ar[])
{
printf("hai");
}
}
How is this problem caused and how can I fix it?
这个问题是如何引起的，我该如何解决？
回答by NullUserException
In addition to the problem that's causing the current exception (see BalusC's answer), the proper "Hello World" in Java is:
除了导致当前异常的问题（参见 BalusC 的回答），Java 中正确的“Hello World”是：
class Test
{
public static void main(String[] args) {
System.out.println("hai");
}
}
See: java.lang.System
回答by LLS
I see your problem, the signature is not correct. It should be public static void main(String[] args)
我看到你的问题，签名不正确。它应该是 public static void main(String[] args)
回答by BalusC
The class which you're trying to execute doesn't have a mainmethod.
您尝试执行的类没有main方法。
Since your mainmethod looks syntactically fine, this can have two causes:
由于您的main方法在语法上看起来不错，这可能有两个原因：
- You're executing the wrong class.
- The actual class file doesn't contain this code.
- 你正在执行错误的类。
- 实际的类文件不包含此代码。
The solution is obvious:
解决方案很明显：
- Make sure that your command is pointing the correct class file, you might have multiple class files with the same name and be sitting in the wrong directory.
- Make sure that you've compiled the correct source file into the correct class file before, you might have edited one and other and forgot to recompile.
- 确保您的命令指向正确的类文件，您可能有多个同名的类文件并且位于错误的目录中。
- 确保您之前已经将正确的源文件编译成正确的类文件，您可能已经编辑了一个和另一个而忘记重新编译。
回答by Jay Askren
It could also be a class path issue which causes Eclipse to get confused and not able to find your class when it tries to run it. I would look at the Java Build Path in the Project Properties to make sure there are no errors.
这也可能是一个类路径问题，导致 Eclipse 感到困惑，并且在尝试运行它时无法找到您的类。我会查看项目属性中的 Java 构建路径以确保没有错误。
